US873958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing homogeneous bodies from tantalum or other highly-refractory metals.
Assignee: Siemens and Halske AG
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Filing: 1907-03-18
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Granted: 1907-12-17
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Expires: 1927-03-18
Abstract
No abstract record available.
Inventors
- 👤 Marcello Von Pirani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:52
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/076
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1910-12-16 | 1911-06-17 | 1911-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-12-16 | 1915-06-17 | 1915-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-12-16 | 1919-06-17 | 1919-12-17 | $7700.00 | Window Closed / Lapsed |